參數(shù)資料
型號(hào)： HE84770
廠商： King Billion Electronics Co., Ltd.
英文描述： 8-bit Micro-controller
中文描述： 8位微控制器
文件頁(yè)數(shù)： 16/30頁(yè)
文件大小： 500K
代理商： HE84770
King Billion Electronics Co., Ltd
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億
電
子
股
份
有
限
公
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HE84770
HE80000 SERIES
If the dual clock mode is used, the LCD display, Timer1 and Timer Base will derive its clock source from
August 25, 2003
This specification is subject to change without notice. Please contact sales person for the latest version before use.
Page 16 of 30
V2.6E
slow clock while the other blocks will operate with the fast clock.
9.
General Purpose I/O
There are three dedicated general purpose I/O port, PRTC, PRTD and PRT10, while PRT14, PRT15 and
PRT17 are multiplexed with LCD segment driver pins. All the I/O Ports are bi-directional and of non-
tri-state output structure. The output has weak sourcing (50
μ
A) and stronger sinking (1 mA) capability
and each can be configured as push-pull or open-drain output structure individually by mask option.
When the I/O port is used as input, the weakly high sourcing can be used as weakly pull-up. Open drain
can be used if the pull-up is not required and let the external driver to drive the pin. Please note that a
floating pad could cause more power consumption since the noise could interfere with the circuit and
cause the input to toggle. A ‘1’ needs to be written to port first before reading the input data from the I/O
pin. If the PMOS is used as pull-up, care should be taken to avoid the constant power drain by DC path
between pull-up and external circuit.
The input port has built-in Schmidt trigger to prevent it from chattering. Hysteresis level of Schmidt
trigger is 1/3*VDD.
VDD
VDD
Q
Q'
LATCH
MO_PP
SCHMIDT Trigger input
DOUT
PAD
DIN
As pads of PRT14, PRT15 and PRT17 are shared with LCD segment driver, the function of the pads is
determined by mask options.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HE84770(S) 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
HE847701 制造商:KB 制造商全稱:KB 功能描述:8-bit Micro-controller
HE847701(S) 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
HE84770C(S) 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
HE84770D 制造商:KB 制造商全稱:KB 功能描述:8-bit Micro-controller
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